James F Dougherty (firstname.lastname@example.org) writes:
> I am working on porting Linux to the IDT R4640
> which is a MIPS R4K on a CMC PCI Mezannine card...
Don't do it, the R4640 has no MMU. Instead, hassle IDT for one of
their brand-new RV64470 CPUs, which is pin-compatible and *does* have
the necessary hardware features.
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